| Abstract | Tijekom ovog istraživanja na području južnog Jadrana prikupljeno je ukupno 1279 jedinki bežmeka Uranoscopus scaber Linnaeus, 1758. Raspon ukupnih duljina tijela jedinki bio je od 8,45 do 36,0 cm (18,12 ± 3,54 cm), a mase od 11,52 do 618,7 g (102,25 ± 59,27 g). Omjer ženki i mužjaka u uzorku iznosio je 1:0,82. Statistički značajne razlike zabilježene su u srednjim vrijednostima jedanaest mofometrijskih odnosa između ženki i mužjaka. Duljinsko-maseni rast bežmeka je izometrijski (b = 3,016), a srednja vrijednost indeksa kondicije iznosila je 1,541. Intenzitet hranjenja najveći je u proljeće, a ribe su neophodna i glavna hrana tijekom godine. Starost bežmeka je određena očitavanjem otolita. Najstarija ženka imala je 8 godina, a najstariji mužjak 6 godina. Rast bežmeka je opisan von Bertalanffyjevim modelom rasta L∞ = 48,93 cm, K = 0,12, t0 = -1,6, R2 = 0,94. Mužjaci bežmeka postaju spolno zreli (Lt = 12,19 cm) pri manjim ukupnim duljinama tijela nego ženke (Lt = 14,12 cm). Fekunditet je bio relativno nizak, a sezona mriještenja bežmeka u južnom Jadranu je od ožujka do listopada. Najveće srednje vrijednosti gonadosomatskog indeksa zabilježene su u svibnju za ženke i u lipnju za mužjake. Vrijednosti ribolovne smrtnosti (F = 0,411) su bile veće od vrijednosti prirodne smrtnosti (M = 0,128). |
| Abstract (english) | In the present study, a total of 1279 specimens of the stargazer Uranoscopus scaber Linnaeus, 1758. were collected. Total lenght of stargazer ranged from 8.45 to 36.0 cm (18.12 ± 3.54 cm), while total weight ranged from 11.52 to 618.7 g (102.25 ± 59.27 g). Female to male ratio was 1:0.82. The differences between the eleven mean values of the measured morphometric characteristics in females and males were statistically significant. The length-weight relationship showed isometric growth (b = 3.016) and estimated condition factor was 1.541. The highest feeding intensity of the stargazer was recorded during spring and the dominat food component was fish. Age of the stargazer was determined by otolith reading. Maksimum ages for females and males were 8 and 6. The growth of fish was described using the von Bertalanffy growth model: L∞ = 48.93 cm, K = 0.12, t0 = -1.6, R2 = 0.94. Males of the stargazer reached maturity (TL = 12.19 cm) at smaller lengths than females (TL = 14.12 cm). The fecundity of females was relatively low, while spawning of the stargazer in southern Adriatic Sea takes place between March and October. The highest mean values of gonadosomatic index were recorded in May for females and in June for males. Fishing mortality values of the stargazer (F = 0.411) were higer than values of natural mortality (M = 0.128). |
